Ok, there is a small fluid reservoir on the top center of the engine, just under the plastic trim…can anyone tell me what that is? It looks kinda like a coolant tank but i am not certain. Please help solve this mystery.

 

Separate cooling circuit for Intercooler. Should take the same coolant as your radiator.
Make sure it’s not low

 

ok so now how do I know the fill level? I suspect it is low but? It doesn’t seem to have an indicator line>

 

Sorry for the follow up, but what are the issues it would cause if low?

 

Top is the “split line” on the reservoir.
https://mbworld.org/forums/e-class-w...reservoir.html




Engine may lose power on hot days or heavy usage. It could also trigger check engine light.
May also lead to to engine damage in extreme cases.

Good Luck,